Hard liquor that is 60 proof equals how much actual ethyl alcohol?

The formula to calculate the amount of actual ethyl alcohol in a liquor is:

Actual Ethyl Alcohol (%) = Proof (%) / 2

Given that the hard liquor is 60 proof:

Actual Ethyl Alcohol = 60 / 2 = 30%

Therefore, the hard liquor that is 60 proof contains 30% actual ethyl alcohol.